import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

class MyThreadPool{
    //任务队列
    private BlockingQueue<Runnable> queue = new ArrayBlockingQueue<>(1000);

    //将任务添加进任务队列中
    public void submit(Runnable runnable) throws InterruptedException {
        //此处咱们的 拒绝策略 相当于第5种（阻塞等待）
        queue.put(runnable);
    }

    public MyThreadPool(int n){
        //创建出第n个线程，负责执行上述队列中的任务
        for (int i = 0; i < n; i++) {
            Thread t=new Thread(()->{
               //让这个线程，从队列中消费任务，并进行执行
                Runnable runnable= null;
                try {
                    runnable = queue.take();
                    runnable.run();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            });
            t.start();
        }
    }

}

public class demo2 {
    public static void main(String[] args) throws InterruptedException {
        MyThreadPool myThreadPool=new MyThreadPool(4);
        for (int i = 0; i < 1000; i++) {
            int id=i;
            myThreadPool.submit(new Runnable() {
                @Override
                public void run() {
                    System.out.println("执行任务："+id);//修改变量？
                }
            });
        }
    }
}
